Trimming mechanism for sewing-machines.



J. BERGER.

IRIMIVIING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED 1AN.29. ISM

Patented Mar. 4, 1919.

3 SHEETS-SHEEI I- J. BERGER.

MECHANISM FOR SEWING MACHlNES.

APPLICATION FILED JAN. 29' 1914.

TRIMMING Patented Mar. 4, 1919.

3 SHEETS -SHEEI 2- I amuawto o J. BERGER.

TR IMMING MECHANISM EOR SEWING MACHINES. APPLICATION FlLED JAN. 29.1914.

1 ,296,45 5 Patented Mar. 4,1919.

3 SHEETS-SHEH' 3- wwuto o JOSEPH BERGER, 0E UTIGA, NEW YORK Assmnon TOUNION SPECIAL MAGHiNE comm, or CHICAGO, ILLINOIS, A CORPORATION orILLmoIs.

ING- MECHANISM FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented Mar. 4, 1919.

Application filed January 29, 1914. Serial No. 815,266.

To all whom it may concern:

Be it known that I, Josnrn BERGER, a citizen of the United States,residing at Utica, in the county of Oneida, State of New York, haveinvented certain new and useful Improvements in Trimming Mechanism forSewing-Machines, of which the following is a description, referencebeing had to the accompanying drawing, and to the figures of referencemarked thereon.

The invention relates to new and useful improvements in trimmingmechanism for sewing machines and particularly to a trimming mechanism"wherein ,the trimming members operate in a horizontal plane in advanceof thecross stitching mechanism, such as shown; for, example, in thepatent granted 1 to Stockton-Berton May th, 1893, No.

An object of the invention is to provide means for actuating the movabletrimming member, which means has a positive connection with the movabletrimming member and is so constructed that the movable trim- 1 mingmember may move up and down with the presser foot. V

A futher object of the invention is to provide a deflector which ismovable with the trimming member for deflecting the trimmed ofl stitcaway from the cross stitching mechanism.

A further object of the invention is to provide a trimming mechanism ofthe above character, which includes a movable trimming blade guidedliythe resser foot and a stationary blade fixed to t e presser foot.

" These and other objects will in part be obvious and will in part behereinafter more fully described.

In the drawings which show b way'of illustration one embodiment of t einvention:

Figure 1 is a side view of a sewing ma- I chine, embodyin myimprovements.

Fig. 2 is a horizontal sectional view, showing the trimming mechanismand-work supj pbrt in plan view.'

Fig. 3 is an enlarged deta l view, partly in section, showing thetrimmmg mechanism in plan view.

Fig. 4 is a detail in perspective, showing the trimming mechanism andpresser foot.

Fig. 5 is a transverse sectional viewthrough the presser foot, showingthe fabric, the trimming mechanism and the deflector.

a 'side wheel feed-up-the-arm sewing Fig. 6 is a detail in perspective,showing more or less diagrammatically, the fabric being trimmed, thetrimming blade and the stitching uniting the abutted edges of thefabric.

The invention consists generally in providing a trimming mechanismwherein the trimming blades are located in front of the stitch formingmechanism and are so disposed that the movable trimmin blade moves insubstantially a, hori zonta plane. The purpose of this trimmin mechanismis to trim the edges of the fa ric which are subsequently abutted andstitched together by a cross stitching mechanism. The trimming mechanismis operated positively by a link connection with an eccentric on themain shaft. This link connection is so disposed that the trimmingmembers may move up and down with the presser foot without disturbingthe actuating connection therefor. A deflector is attached to the armsupporting the movable trimming blade and exand above the same, so thatthe trimmed ofi' strip is moved by said deflector away from the path ofthe cross stitching mechanism.

ferring more in I have shown the .invention asjapplied' to mm chine,which consists of a supporting base 1, carrying an overhanging arm 2, onwhich is mounted: av needle gate 3, in which reciprocates the needle bar4. This is reciprocated by a' needle lever 5 which is pivoted at 6 tothe overhanging arm 2. The needle lever extension 7 carries a ball studto which is attached an eccentric strap 8, which coo erateswith aneccentric on the main'fsha 9. The needle lever 5 is connected by a link10 to the needle bar. The needle gate 3 is 05-- detail to the dracillated in a well known manner, so as to position the needle bar firston one side of the center line of the seamand thenthe other, so. thatthe needle thread is laid across the center line of the seam.

A cylindrical work support 11 is carried by the standard of the machineand a feed dog 12 is carried and moved by the feeding mechanism locatedwithin said. cylindrical bed plate, which mechanism is so constructedthat the material to be stitched is fed up the arm or cylindrical bedplate. A looper located within the work support coiiperates with theneedle both of its positions, so

that a looper thread loop joins loops beneath the material. By

be used for joining abutted edges of fabric. The above mechanism is wellknown in the sewing machine art and forms no part of shank 15, which isprovided with lateral pro- 'jecting arms 16 adapted to engage a rod 17which is also mounted in suitable bearings in the overhanging arm andprevents the presser bar 14 rom turning in its supporting bearings. Thepresser foot is slotted at the forward end, as at 18. The walls formingthe slot 18 are tapered away from the center line of the seam, asclearly illustrated in Figs. 3 and 4. I

At the forward end of the work support 11 is a V-shaped rib 19 which isadapted to turn up the edges when two edges of the fabric are to beabutted and stitched, or is adapted to form a fold in the fabric when asection is to be cut away from the fabric, as illustrated in Fig. 6. Inthis figure the fabric is indicated at F, the trimmed ofi strip at S andthe cross threads for uniting the abutted edges at T. The folded upportion to be trimmed ofl extends into the slot 18 and above the upperface of the presser foot.

A stationary trimmer blade 20 extends through a slot 21 in the presserfoot 13 and a is held therein by a screw 22. This trimmer blade extendsthrough to the slot 18. The upper part of the presser foot adjacent theinner end of the stationary blade 20 is cut away as'at 23. The otherside of the presser foot has a recess at 24 on its upper face in stud 27by a screw '15.

which reciprocates the movable trimming blade 25. This movable trimmingblade 25 cotiperates with the stationary blade 20. The movable blade iscarried by an arm 26, which is fixed on a stud 27, mounted in 'laterallyprojecting ears 28 and 29 formed in the shank of the presser foot 15:The arm 30 projects substantially at right angles to the arm 26 andforms with the arm 26 a rock lever. The pivotal support for the rocklever is in the center line of the seam and, therefore, the trimmingblade 25 is moving substantially at-right angles to the line of seamduring its trimming action. The arm 26 is secured to the stud 27 by aset screw 30*. The distance between the ears 28 and 29 1s slightlygreater than the thickness of the arm 26. A plate 27 engages the upperend of the stud 27 and this plate is held in place and pressed againstthe end of the This plate 27 the needle this mecha- Stationary bladen1sm a cross stitching is made which may '20 has anupturned end 20 asclearly shown.

long link and, therefore,

forces the blade 25 into contact with the 20. The stationary blade inthe drawings, and this end may be ground ofi on its upper face to keepthe blade sharp and the pressure of the blades against each other isvaried by turning the screw The outer end of the arm 30 carries a ballstud 31 to which is attached a link 32. This link 32 is formed integralwith an eccentric strap 33, shown in dotted lines in Fig. 1, whichcooperates with an eccentric 34 on the main shaft 9. This link 32 isrelatively a the trimming mechanism may presser bar 14 as the thicknessof the-material varies without in anyway disturbing the actuatingmechanism for the trimming blade, and at the same time said trimmingblade is positively oscillated in both directions.

A deflector 35 is fixed by screws 36 to the arm 26. This deflectorextends over the trimming blade 25 and has an inclined forward end 37When the trimming blade move up and down with the moves forward thedeflector moves forward therewith and will engage the strip which istrimmed off and deflect the same to one side of the needle carried bythe needle bar 4. The relative position of the stitch forming mechanismis indicated in Figs. 3 and 4 by the needle opening 39 of the presserfoot 13. In Fig. 3 the trimming blade is shown at the rear end of itsstroke and it'will be noted that the inclined face of the deflector 35extends substantially across the line of seam from one side of theneedle to the other, see Fig. 3. This inclined face deflects the trimmedoff strip and the movements of the deflector assist in the bending ordeflecting of the strip. The presser foot is cut away, as at 40, tofacilitate the lateral deflection of the trimmed ofl' strip.

In the operation of the device when two edges of fabric are to beabutted the edges are placed together and are bent upwardly by the V-haped part 19, so that said edges will pass into the slot 18 insubstantially a vertical position. The movable trimming blade whichreciprocates across the slot will trim off said upwardly projectingedges and the trimmed ofl' strip will be deflected lateraly by thedeflector 35, while the trimmed edges pass underneath the presser footand. are placed in an abutted position prior to the edges reaching thestitching point and the needle will pass first into one edge and thenthe other, thus joining the edges by cross threads which are formed intoloops extending beneath the material and which are united on the underface of the material by looper thread loops.

VVh'en it is desired to shape a tubular garment the tube may be slippedover the cylindrical arm and a portion of the fabric will be bent into afold and may be carried into the slot 18, so that the trimming memberswill operate to trim off a portion of the tube and the edge will passfrom the trimming mechanism to the stitch forming mechanism where theywill be abutted and joined. By varying the amount of the fold formed inthe fabric the garment may be shaped.

It is obvious that minor changes in the details may be made withoutdeparting from the spirit of the invention, as set forth in the appendedclaims.

Having thus described my invention, what I claim as new is- 1. Atrimming mechanism for sewing inachines including in combination, a worksupport, stitch-forming mechanism, a presser foot, a trimming blade,means for supporting and moving the trimming blade in substantially ahorizontal plane, a stationary trimming blade cooperating with saidmovable trimming blade, said stationary blade having its forward edgeupturned to provide a cutting edge to cooperate with said movable blade.

2. A trimming mechanism for sewing machines including in comblnation, awork support, stitch-forming mechanism, a presser foot, a trimmingblade, means for supporting and moving the trimming blade insubstantially a horizontal lane, a stationary trimming blade cooperatingwith said movable trimming blade, said stationary blade having itsforward edge upturned to provide a cutting-edge to cooperate with saidmovable blade, and means for depressing said movable blade into contactwith said stationary blade.

3. A sewing machine including in combination, a work support, a presserfoot having a slot in its forward end into which the fabric to betrimmed may be guided in substantially a vertical position, said presserfoot having a recess in its upper face, a stationary trimmer bladecarried by the presser foot and having the forward end thereof upturnedto form a. cutting edge, a movable trimming blade, reciprocating in saidrecess across said slot and cooperating with the cutting edge of saidstationary blade, and means for actuating said movable trimming blade.

4. A sewing machine including in combination a movable trimming member,a

presser bar, a presser foot carried by said bar, a horizontally disposedstationary trimming blade mounted on the presser foot, a rod parallelwith the presser bar, said presser foot having a projecting arm engagingthe rod whereby the tendency of the presser foot to turn under thestrain of the trimming action will be prevented.

In testimony whereof, I afiix my signature,

in the presence of two witnesses.

. I JOSEPH BERGER. Witnesses:-

A. D. ELDRED, JOHN MILLER.

